Flexible printing form



Nov. 3, 1925 C. CHISHOLM FLEXIBLE PRINTING FORM Filed Dec. 6.v 1923 wxmWM 36% man N// A? TOENEYZS Patented Nov. 3, 1925.

UNITED STATES PATENT OFFICE. I

CLIFTON OHISHOLM, OF GLEVELAND, OHIO, ASSIGNOB TO THE AMERICAN MULTI-GRAPH COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FLEXIBLE PRINTING FORM.

Application filed December 6, 1923. Serial No. 678,888.

To all whom it may concern:

Be it known that I, CLIFTON OHISHOLM, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in a Flexible PrintingForm, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings.

The object of this invention is to provide a very simple and eflicientflexible form adapted to carry embossed printing strips, whereby aprinting blanket is provided, adapted for use in a suitable printingmachine. My printing form may be used either on a rotary drum or a flatsupport as desired.

My flexible form comprises a flexible sheet of metal and a plurality ofparallel bars rigidly secured thereto and having undercut edges wherebyembossed strips having inwardly flanged edges may be slid over said barslongitudinally thereof, and be thereby retained in place. I find thatthe 2 metal sheet may have the desired thinness to enable it to bereadily flexed at the same time the bars may be effectively securedthereto by electric welding.

In the drawing Fig. 1 is a perspective of my flexible blanket, the samebeing shown as having a portion intermediately broken out;'

Fig. 2 is a perspective on an enlarged scale of a portion of saidblanket with embossed strips in place; Fig. 3 is a longitudinal sectionalong one of the bars and supporting plate; Fig. l is an end View, of atype holding segment with the blanket mounted thereon.

As shown in the drawing, 10 indicates a sheet metal plate having theedges 11 thereof curled or bent inwardly to provide suitable means foranchoring the blanket in place. 20 indicates parallel bars, each oftrapezoidal form in cross section, whereby,

when they are secured by their narrower parallel faces, undercut oroverhanging edges are provided. These bars are mounted parallel witheach other on the plate 10, and secured thereto by electric welding,preferably by spot welding, as indicated at 21 in Fig. 3.

30 in Figs. 2 and 4 indicate metal strips having on them embossedprinting characters 31. These strips have inwardly flanged edges 32,whereby they may he slipped endwise on to the bars 20 and holdthemselves thereon by underhanging the wider top surface at the bars.

It will be seen that the construction described is extremely simple andcan be cheaply manufactured. Such a blanket.

carrying embossed strips may be mounted on a flat block for use in anordinary printing press, or, if desired, may be mounted on the cylinderof a rotary machine. In Fig. 4;, I have shown the blanket mounted on asegment 40 of a multigraph machine, in which case the curledin edges 11of the blanket extend around the heads of suitable rails ll of thesegment.

I claim:

1. A flexible blanket comprising an uninterrupted flexible sheet ofmetal, and parallel bars with overhanging edges joined to the face ofthe sheet.

2. A flexible blanket comprising a flexible sheet of metal, and solidparallel rails with overhanging edges autogeneously joined in spots tothe top face of the sheet.

3. The combination of a flexible sheet of metal, and parallel bars eachtrapezoidal in cross section and resting with. its narrower parallelface in contact with the plate, said bars and plate being joinedtogether.

In testimony whereof, I hereunto aflix my signature.

CLIFTON CHISHOLM.

